To convert degrees Celsius to kelvins, use K = °C + 273.15. For example, 30 °C = 303.15 K.
How to convert Celsius to Kelvin
- Type the value in degrees Celsius.
- The answer in kelvins appears instantly, with the formula.
- Use ⇄ to swap the direction, or pick other units.
Celsius to Kelvin formula
K = °C + 273.15
Example: 30 °C = 303.15 K.
Reverse: 1 K = -272.15 °C (see Kelvin to Celsius).
Celsius to Kelvin conversion table
| Celsius (°C) | Kelvin (K) |
|---|---|
| -40 | 233.15 |
| -20 | 253.15 |
| -10 | 263.15 |
| 0 | 273.15 |
| 5 | 278.15 |
| 10 | 283.15 |
| 15 | 288.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 30 | 303.15 |
| 35 | 308.15 |
| 36.6 | 309.75 |
| 37 | 310.15 |
| 38 | 311.15 |
| 39 | 312.15 |
| 40 | 313.15 |
| 45 | 318.15 |
| 50 | 323.15 |
| 60 | 333.15 |
| 70 | 343.15 |
| 80 | 353.15 |
| 90 | 363.15 |
| 100 | 373.15 |
| 150 | 423.15 |
| 180 | 453.15 |
| 200 | 473.15 |
| 220 | 493.15 |
| 250 | 523.15 |
About these units
Celsius (°C): Water freezes at 0 °C and boils at 100 °C at sea level. Used for weather in most countries.
Kelvin (K): The SI unit of temperature. 0 K is absolute zero (−273.15 °C).
Frequently asked questions
How do you convert Celsius to Kelvin?
Use K = °C + 273.15. For example, 30 °C = 303.15 K.
What is 37 °C in Fahrenheit?
98.6 °F, normal body temperature.
Updated October 2026 · Built and tested by Sharjeel Tahir · How our tools are tested